1323ae417e
Uncovered by @bjorn3 (thanks!): 8- and 16-bit rotates were not working properly in recent versions of Cranelift with part of the lowering migrated to ISLE. This PR fixes a few issues: - 8- and 16-bit rotate-left needs to mask a constant amount, if any, because we use a 32-bit rotate instruction and so don't get the appropriate shift-amount masking for free from x86 semantics. - `operand_size_from_type` was incorrect: it only handled 32- and 64-bit types and silently returned `OperandSize::Size32` for everything else. Now uses the `OperandSize::from_ty(ty)` helper as the pre-ISLE code did. Our test coverage for narrow value types is not great; this PR adds some runtests for rotl/rotr but more would always be better!
This crate contains the core Cranelift code generator. It translates code from an intermediate representation into executable machine code.